I got advice from Dertonarm to use 50/50 VTF adjustment;
50 with weight adjustment and 50 with ''spring'' (aka dynamic
adjustment). This imply using an ''external'' VTF scale .
But as by Lew my ''spring scale'' is perfect, very practical
and easy to use so I have no desire to complicate the matter.
More time to listen to the music than mess with adjustments.